Bicycle lighting generator



Dec. 14, 1937. P. RATHMANN BICYCLE LIGHTING GENERATOR Filed Fab. 10, 1937 Patented Dec. 14, 1937 UNITED STATES PATENT OFFICE BICYCLE LIGHTING GENERATOR slovakia Application February 10, 1937, Serial No. 125,107 In Czechoslovakia February 15, 1936 3 Claims. (01. 171-209) My invention relates to lighting generators for bicycles, motor-cycles etc. and more especially to that kind of generator comprising a pole magnet rotating in a bipartite cage surrounding an induction coil.

In generators of this type, in order to obtain a favorable output, the air gap between the magnet and the poles of the armature must be reduced to a minimum, which again requires a very exact positioning of the pole magnet. This magnet can be supported only on one side and to this end the cage enclosing the induction coil carries a lateral tubular extension serving to support the end of the magnet spindle. An exact positioning of the magnet therefore requires this lateral tubular extension of the cage to be located strictly centrically of the cage and to be firmly fixed in position relative to it;

In the lighting generator according to this invention this problem is solved in this way, that the tubular extension is formed by a drawing operation and has a flange projecting from one end, the outer edge of which fits exactly the inner surface of theouter wall of the adjoininghalf of the cage and is secured against displacement, for instance by means of checks formed in the flange by stamping.

In order further to firmly connect the tubular extension with the casing in a readily disengageable manner, for the purpose of withdrawing the generator from the casing for repairs 9. leaf spring is provided which extends in parallel to the tubular extension and one end of it is fixed to the extension adjoining the rotor, while a nose formed at its free end projects into a perforation formed in the casing and thus locks the tubular extension to the casing, being readily forced back whenever it is desired to withdraw the generator from the casing.

In the drawing afiixed to the specification and forming part thereof a lighting generator embodying my invention is illustrated diagrammatically by way of example.

In the drawing Fig. 1 is an axial section, while Fig. 2 is a cross-section on the line 11-11 in Fig. 1.

Fig. 3 is an axial section of the cage.

Referring to the drawing, I is the pole magnet forming the rotor of the generator, which is of a type well known as such and therefore need not be described in detail and 2 is the spindle. 3 is the induction coil and 4, 5 is the bipartite cage, the inner annular wall of which is formed by tongues 6 and 1, respectively, which form the poles of the armature. The tongues 6 of the top part 4 of the cage project into the gaps between adjoining tongues l of the part 5 of the cage, as shown more particularly in Fig. 3. I

The spindle 2 extends above the magnet and is surrounded by the tube 8, formed by drawing. A flange 9 extending at right angles to the lower end of the tube is formed with projecting arms 10, the outer ends of which are bent into hooks'hape at H. Between each pair of adjoining arms I 0 a tongue 6 of the armature formed by the top half 4 of the cage is accommodated. The flange 9 is so mounted in this half of the cage as to apply itself against the outer wall of the cage and to be centered exactly therein by the arms i0, Ii. It is secured against displacement in the cage part 4 by checks i2 formed in it by stamping, these checks being bent to apply themselves to the inner edge of the end wall l3 of the cage.

The spindle 2 is supported in the tube 8 by means of ball bearings i4 held in place by means of checks I5 formed in the tube wall by stamping. The free end of the spindle 2 carries a pinion is designed to mesh with a pinion driven by the vehicle.-

In order to increase the resistance against deformation offered by the tube 8, it is formed with ribs I6 extending also over the flange 9. A felt disk l'l fixed by means of a washer l8 in slits formed in the flange 9 serves as a packing to prevent the escape of lubricating oil.

is the casing surrounding the dynamo and 2! is the locking spring fixed to the inner wall of the tube B by means of rivets 22, the free end of the spring being formed with a nose 23 projecting through registering perforations in the tube 8 and casing 20 and thus locking the tube in the casing. By forcing back the nose 23 the dynamo can readily be withdrawn from the casing.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

I claim:-

1. In a bicycle lighting dynamo in combination, a rotary pole magnet, a cage of C-shaped cross-section surrounding said magnet, tongues formed on the inner wall of said cage serving as armature poles, a spindle, one end of winch is fixed in said magnet, a drawn tube mounted on said cage, a flange projecting from the end of said tube, the circumferential edge of said flange fitting exactly the inner surface 'of the outer wall of said cage, bearings supporting said spindle armature poles, a spin'dle, one end of which is in said tube and means for preventing displacement of said tube relative to said cage.

,2. In a bicycle lighting dynamo incombination, a rotary pole magnet, a cage of C-shaped cross-section surrounding said magnet, tongues formed on the inner wall of said cageserving as fixed in said magnet, a drawn tube mounted; n said cage, a flange projecting from the eno. of said tube, the circumferential edge of said flange, fitting exactly the inner surface of the outer Wall of said cage, bearings supporting said spindle in said tube, means for preventing displacement of said tube relative to said cage and reinforcing ribs extending from said flange to the adjoining end of said tube.

3. In a bicycle lighting dynamo in combinaof 'said cage, bearings supporting said spindle in said tube-means for preventing displacement 10 of said tube, relative to said cage, a casing surrounding said tube, a leaf spring fixed to the inner wall of said tube and a nose on said spring projecting into registering perforations of said tube and said casing to disengageably lock said 15 tube in position in said casing.

PAUL RATHMANN. 

